Finding the Fourth Proportional to 2,205.18, 3,042.69 and 1,320.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.18 : 3,042.69 = 1,320.78 : x
2. Step 2: Convert to fraction form
   2,205.18/3,042.69 = 1,320.78/x
3. Step 3: Cross multiply
   2,205.18x = 3,042.69 × 1,320.78
4. Step 4: Simplify right side
   2,205.18x = 4,018,724.10
5. Step 5: Solve for x
   x = 4,018,724.10/2,205.18
6. Step 6: Final answer
   x = 1,822.40